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JAIDS Journal of Acquired Immune Deficiency Syndromes:
Brief Report: Clinical Science

Incidence of Immune Reconstitution Syndrome in HIV/Tuberculosis-Coinfected Patients After Initiation of Generic Antiretroviral Therapy in India

Kumarasamy, N. MBBS, PhD*; Chaguturu, Sreekanth MD†; Mayer, Kenneth H. MD†; Solomon, Suniti MBBS, MD*; Yepthomi, H. Tokugha MBBS, DO*; Balakrishnan, Pachamuthu PhD*; Flanigan, Timothy P. MD†

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Author Information

From *YRG Center for Research and Education, VHS, Tharamani, Chennai, India; and †Brown University, Providence, RI.

Received for publication March 4, 2004; accepted July 9, 2004.

Supported by the AIDS International Research and Training Program of the Fogarty International Center of the National Institutes of Health (grant No. D43TW00237) and by the Adult AIDS Clinical Trials Group (AACTG).

Reprints: N. Kumarasamy, YRG CARE, Voluntary Health Services, Tharamani, Chennai 600113, India (e-mail: kumarasamy@yrgcare.org).

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Abstract

This paper describes the incidence of immune reconstitution syndrome (IRS) from the developing world and implications for clinicians. Eleven of 144 HIVand tuberculosis (TB)-coinfected individuals followed for 72 person-years developed IRS within 6 months of initiating generic highly active antiretroviral therapy (HAART). All of the IRS patients were male, with a median age of 29 years; median CD4 at HAART initiation was 123 cells/mm3, and 6-month median CD4 rise was 124 cells/mm3. There was no statistical difference in CD4 rise or CD4 count and duration of TB treatment at HAART initiation between those who did and those who did not develop IRS (P = 0.8380). The median time to development of clinical IRS was 42 days (range 10-89 days). The incidence of IRS in this cohort is 15.2 cases per 100 patient-years. With increased coprevalence of opportunistic infections, especially TB, and increasing access to antiretroviral therapy in the developing world, clinicians in these countries must be able to identify IRS and relieve symptoms without compromising clinical care.

Highly active antiretroviral therapy (HAART) has led to dramatic reductions in HIV-related morbidity and mortality.1 HAART suppresses viral replication, allowing for partial restoration of the immune system and protection against opportunistic pathogens.2 Immune reconstitution, however, can result in an inflammatory response against infectious and non-infectious antigens and an apparent clinical deterioration of the patient. This phenomenon has been described under various descriptions such as "paradoxical reaction," "immune restoration disease," "HAART attacks," "immune reconstitution syndrome (IRS)," and "immune reconstitution inflammatory syndrome."3-5

Previous reports of IRS have primarily been published in the developed world.6 With declining costs in antiretroviral drugs, and production by generic manufacturers, tertiary care centers in the developing world are now able to afford and administer antiretroviral therapy to HIV-seropositive patients.7 With increased coprevalence of opportunistic infections and access to antiretroviral therapy in the developing world,8 we conducted this study to determine the incidence of immune reconstitution in resource-limited settings.

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METHODS

A retrospective cohort study was conducted at YRG Center for Research and Education, an HIV referral center in Chennai, India, to investigate incidence of IRS among HIV/tuberculosis (TB)-coinfected subjects within 6 months of initiating generic HAART. An individual was defined as having active TB in the study if they had symptoms of TB, had radiologic evidence suggestive of TB, and if they were, by microscopy or in culture from sputum or aspirates, positive for acid-fast bacilli. IRS is defined as new lymph node enlargement and localized tenderness or fever with no other cause identified after initiation of HAART after a systemic clinical and laboratory evaluation. Blood, urine, and sputum or pus cultures and blood smear for malarial parasite and microfilaria were done to rule out other causes of fever in the study subjects.

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RESULTS

From May 1, 2000, until January 1, 2003, 333 patients (88% male, 95% acquired HIV heterosexually, median age 33 years) attending YRG CARE were on a generic HAART regimen for at least 3 months. Regimens included nevirapine with zidovudine/lamivudine, stavudine/lamivudine, or stavudine/didanosine. At initiation of HAART, 144 patients (44%) had active TB (107 pulmonary, 38 extrapulmonary) with a total follow-up of 72 person-years. Of these HIV/TB-coinfected patients, 91% were male, 93% had acquired HIV heterosexually, and median age was 34 years. The mean CD4 count at initiation of HAART was 122 cells/mm3, and the mean rise in CD4 counts after 6 months of therapy was 130 cells/mm3.

Eleven subjects (all men, median age 29 years, median CD4 at HAART initiation 123 cells/mm3, 6-month median CD4 rise 124 cells/mm3) were identified as having IRS. The characteristics of the study subjects are shown in Table 1. There was no statistical difference in CD4 at initiation of HAART or rise in CD4 after initiation of HAART between those who did and those who did not develop IRS (P = 0.8380). The median time to IRS was 42 days (range 10-89 days). The incidence of IRS in this cohort is 15.2 cases per 100 patient-years. The median duration between initiation of TB treatment and HAART initiation among the IRS group was 22 days and among persons without IRS it was 25 days (P = 0.8). Short-course steroids, aspiration, and counseling were selectively offered.

Table 1
Table 1
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DISCUSSION

Following HAART, with the increase in CD4 T lymphocytes, there is shift toward a T-helper 1 (TH1) receptor profile, increasing production of inflammatory mediating cytokines such as interferon-γ and interleukin-2.9 In the case of TB, the predominant opportunistic infection in this case series, TH1 cytokines are critical to immunity. By augmenting the expression of TH1 cytokines, antiretroviral therapy improves the host response to TB.10,11 Unfortunately, the host's enhanced ability to mount an immune reaction and protect from the destruction of infectious agents may itself cause morbidity to the host.3,12,13 There have been cases published of clinical "progression" despite adequate anti-TB and antiretroviral therapy, including prolonged fever, increasing respiratory symptoms, increasing lymphadenopathy, ascites, and growth of intracranial tuberculomas.14,15

In this cohort from a resource-limited setting with a high background rate of TB, there is a high incidence of IRS. As the use of antiretroviral therapy increases in the developing world, initiation of therapy while patients have active opportunistic infections will lead to significant morbidity. An association between the duration of initiation of TB treatment and HAART initiation was seen in an earlier study for the occurrence of IRS.10 This association was not seen in our series. Appropriate therapy must be maintained in the face of apparently worsening clinical symptoms. The use of corticosteroids has anecdotally been successful in decreasing IRS without significantly compromising clinical care.16,17 In the case of TB-associated IRS, fine-needle aspiration cytology will usually show non-specific inflammatory reaction or beaded acid-fact bacilli consistent with previously treated TB.18,19 Therapeutic aspiration can be used to temporarily reduce lymph node bulk. However, there are no definitive guidelines for care of the patient with IRS. At this center, patients are counseled on the condition and are advised to continue with treatment. All patients are currently stable and tolerating therapy with no further adverse events.

With reports of IRS growing in frequency, and now detected significantly in a tertiary HIV center in the developing world, clinical trials in developing countries need to be conducted to help physicians better understand when to initiate antiretroviral therapy in the context of opportunistic infections. In addition, without adequate guidelines to identify and treat IRS, clinicians treating HIV-infected individuals in the developing world will face a new set of challenges to safe and effective therapy.

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ACKNOWLEDGMENTS

The authors thank the clinical staff of the YRG Centre for Research and Education, Chennai, India, and of the Immunology Center at Miriam Hospital, Providence, RI, for their generous facilitation of the study.

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REFERENCES

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The Pediatric Infectious Disease Journal, 25(1): 53-58.

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Keywords:

India; tuberculosis; HIV; AIDS; immune reconstitution syndrome; immune reconstitution inflammatory syndrome; immune reconstitution inflammatory syndrome; highly active antiretroviral therapy; opportunistic infection

© 2004 Lippincott Williams & Wilkins, Inc.

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